Login with Google: "The page you requested is not valid."

When I try to login with Google, I get "The page you requested is not valid." Here's an example URL: http://newscubamarketing.com/facebook-timeline-for-pages/

I've tried different browsers, cleared cache/cookies, tried deactivating all other plugins and default theme, tried all variations of activating FB/Twitter JS with no luck.

WP 3.3.1
Multisite
NO BuddyPress
Comments Plus 1.4